code: def stop(timer=None, loop=None):
      """Callback to fire when there's input to be read"""
      _triggered.set()
      NSApp = _NSApp()
      # if NSApp is not running, stop CFRunLoop directly,
      # otherwise stop and wake NSApp
      if msg(NSApp, n("isRunning")):
          msg(NSApp, n("stop:"), NSApp)
          _wake(NSApp)
      else:
          CFRunLoopStop(CFRunLoopGetCurrent())
  
file_path: catboost/contrib/python/ipykernel/py3/ipykernel/_eventloop_macos.py
imports: import ctypes
  import ctypes.util
  from threading import Event
label_desc: Use image node_id 6 for calling a global function with example usage: stop(timer, loop) without return types